TS ISO 7404-1

TS ISO 7404-1 is the first part of the coal petrographic analysis series and defines the shared vocabulary used in this field. It focuses on the terms associated with maceral and microlithotype analysis and with the determination of vitrinite reflectance, helping to standardise language in coal petrography.

Why terminology matters in coal petrography

Coal petrography examines the organic constituents of coal under the microscope. Macerals are the major organic components of coal, while microlithotypes describe specific associations of those components. Vitrinite reflectance is an important optical parameter used to indicate coal rank and maturity. By aligning the names and concepts used for these topics, the standard supports clearer reporting and more consistent comparison of results.

Scope and boundary of this part

• Applies to terms used in the examination of coal of all ranks and types.
• Covers terminology linked to maceral and microlithotype analyses.
• Includes terms used in determining vitrinite reflectance.
• Is not intended to be a comprehensive glossary of coal petrographic terminology.
• Does not provide enough information to identify all of the coal components described.

In practice, this part functions as a terminology reference rather than a detailed test method. Its value lies in giving laboratories, researchers and technical readers a common conceptual basis so that petrographic observations and measurements are described consistently.